Question

A student is completing a Punnett square for a trait (T/t) that is autosomal and inherited by the dominant allele. The father does not have the trait (tt) but the mother does (Tt). If they had two children, a son and a daughter, what would the completed Punnett square look like (i.e., would the son have the trait, would the daughter have the trait?) (1 point)  

📄 Responses
( ) Each child would have a 100% chance of inheriting the trait.

( ) Each child would have a 0% chance of inheriting the trait.

( ) The son would inherit the trait and the daughter would not.

( ) Each child has a 50% chance of inheriting the trait.

Answer 1

Answer: ( ) Each child has a 50% chance of inheriting the trait.

Explanation: Mother = Tt, Father = tt. Punnett square (mother across, father down):

T | t
t Tt | tt
t Tt | tt

So 2 Tt (have trait) and 2 tt (no trait) = 50% chance for each child, regardless of sex.